 /*******************************************************************************
  * Copyright (c) 2006, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  * Brad Reynolds - bug 164653
  *******************************************************************************/

 package org.eclipse.core.databinding.observable;

 import org.eclipse.core.runtime.Assert;
 import org.eclipse.core.runtime.AssertionFailedException;

 /**
  * @since 1.0
  */
 public abstract class AbstractObservable extends ChangeManager implements IObservable {
     
     /**
      * @param realm
      */
     public AbstractObservable(Realm realm) {
         super(realm);
     }

     public synchronized void addChangeListener(IChangeListener listener) {
         addListener(ChangeEvent.TYPE, listener);
     }

     public synchronized void removeChangeListener(IChangeListener listener) {
         removeListener(ChangeEvent.TYPE, listener);
     }

     public synchronized void addStaleListener(IStaleListener listener) {
         addListener(StaleEvent.TYPE, listener);
     }

     public synchronized void removeStaleListener(IStaleListener listener) {
         removeListener(StaleEvent.TYPE, listener);
     }

     protected void fireChange() {
         checkRealm();
         fireEvent(new ChangeEvent(this));
     }

     protected void fireStale() {
         checkRealm();
         fireEvent(new StaleEvent(this));
     }

     /**
      *
      */
     public synchronized void dispose() {
         super.dispose();
     }

     /**
      * Asserts that the realm is the current realm.
      *
      * @see Realm#isCurrent()
      * @throws AssertionFailedException if the realm is not the current realm
      */
     protected void checkRealm() {
         Assert.isTrue(getRealm().isCurrent());
     }
 }

